Angle that is smaller than a right angle (less than 90Â°). Angle formed by two lines or two perpendicular planes that measures 90Â°. Symbol denoting that a straight line meets another at a right angle. Symbol denoting that two straight lines do not remain at a constant distance from one other. Symbol denoting that two straight lines remain at a constant distance from one another.
Constriction vs. Dilation. Constriction and dilation are opposite, but related, processes in the body. Whereas dilation is an opening or widening of a structure or passageway to increase material flow, constriction leads to a decrease in material flow by closing the passage.
Opposite 'Opposite' refers to something that is facing another object. In other words, 'opposite' refers to two objects or people that are looking at each other. The main difference between 'in front of' and 'opposite' is that 'in front of' refers to placement in a sequence, whereas 'opposite' refers to things that face each other. Two synonyms can be used for 'opposite': facing and across from.